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So it's cold season again, and it seems like every other person has a cold. The immune system can remember what it's had to fight in the past, like how some people can build an immunity to certain things by being exposed to it often, such as insect bites or what immunization shots are for, the body creates antibodies to fight that specific thing and keeps a supply of them just for future encounters. So if you catch a cold from say your cousin, and you recover faster than they do... theoretically, you should be immune to their germs, as it's the same strain you have already fought off. I suppose that also means that you can catch a new cold when you still have some of your last one, if say you first catch a cold from your cousin, then one from a co-worker O.o